I agree on using the larger hose. Exhaust backpressure is usually not a good
thing for an engine.
While you are doing all this consider putting a thermoswitch on the exhaust
hose just south of the water injection point to warn you if you loose seawater
flow. The hose is the first thing to get hot.
You can get one from a HVAC supply store. They are used for turning on attic
fans. They are normally-open and close at 120 deg F.
I am not home so I cannot tell you the brand/model (it may be in the archives)
but it was about $10, was small with two mounting holes on lugs. I mounted it
with the flat sensing side on the hose and a spring from hole to hole around
the hose.
Norm
S/V Bandersnatch
Lying Julington Creek
30 07.695N 081 38.484W
----- Original Message -----
From:
To: [email protected]
Sent: 11/25/2008 9:38:53 AM
Subject: Re: [Liveaboard] Exhaust hose
Generally there is an elbow just after the heat exchanger with water injection
to cool the exhaust gasses and then a heat resistant exhaust hose to the
through hull. Sometimes there is a water lift muffler in the middle to reduce
noise and sometimes a water separator to discharge the water and exhaust
separately to reduce noise. The water injection should be lower than the top of
the elbow so it doesn't put water back into the exhaust manifold, but it needs
to be high enough in the elbow to allow mixing with the hot exhaust to cool it
enough to prevent burning through the exhaust hose attached somewhere below the
top of the elbow. My guess is that the heat exchanger and exhaust elbow are two
inch and the through hull is 2 5/8 and the elbow that you speak of was used as
a transition point. My thoughts are that bigger is better. I'd go to the larger
size for the entire run to decrease back pressure on the exhaust. Twenty feet
is a long run for an exhaust hose of only two inche!
s.
_______________________________________________
Liveaboard mailing list
[email protected]
To adjust your membership settings over the web
http://www.liveaboardnow.org/mailman/listinfo/liveaboard
To subscribe send an email to [EMAIL PROTECTED]
To unsubscribe send an email to [EMAIL PROTECTED]
The archives are at http://www.liveaboardnow.org/pipermail/liveaboard/
To search the archives http://www.mail-archive.com/[email protected]
The Mailman Users Guide can be found here
http://www.gnu.org/software/mailman/mailman-member/index.html
